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CVE-2026-83605

xmldom: Attribute name injection via setAttribute() bypasses requireWellFormed

Published: Sep 1, 2026Updated: Sep 8, 2026 Sources: CVE List NVDCWE-91
N/ACVSS
NVD MITRE
EPSS Score
0.3%
Top 71.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14 and 0.9.11, and in xmldom version 0.6.0 and earlier, Element.setAttribute() calls the private _createAttribute(name) path without validating the attribute name, while Document.createAttribute(name) validates against QName. XMLSerializer.serializeToString() emits attribute names verbatim, and requireWellFormed: true did not validate them, so a crafted name can terminate the intended attribute and inject additional attributes, including event handlers, into browser-consumed output; synthesized xmlns:PREFIX declarations expose the same unchecked-name boundary. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.

No summary for this CVE yet.

Weaknesses

CWE-91

Affected Products

xmldom
oss-project
xmldomLibrary
OSS Libraries / npm
@xmldom
xmldom

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

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MITRE ATT&CK

1 technique
Initial Access
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References

https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e
github.com
https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44
github.com
https://github.com/xmldom/xmldom/pull/1043
github.com
and 4 more references View all →
News mentions
1

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